Analysis of a high level of particulate-pollution event in Paris Megacity by integrating in-situ and remote sensing aerosol / gas measurement at the SIRTA ACTRIS Observatory

Abstract : A high level of particulate-pollution event has been observed in Paris Megacity between 6 and 15 March 2014. The SIRTA Observatory has documented all atmospheric variables between surface and the top of free troposphere with in-situ sensors and active/passive remote sensing instruments. We will describe the instrumental dataset (more than 150 instruments), meteorological conditions and variability of some species, such as (i) aerosol (particle mass, chemistry, size distribution and absorption/scattering), (ii) reactive gas (type, chemistry), (iii) radon and GES and (iv) isotopic species (CO2, CH4 and H2O). A specific attention will be given in this presentation to understand the processes responsible for the high concentration level of thin particles (smaller than 2.5µm with a medium radius around 0.2µm) in a thin mixing layer (night 200m and day 600-1200m). All these collocated measurements on the Saclay plateau (ACTRIS platform) is an ideal place to conduct this work. In fact, the chemical analysis shows that the major part of these particles were secondary aerosols related to anthropogenic activities such as traffic, wood burning and agriculture. And, the geochemical tracers, active and passive remote sensing instruments (lidars, cloud radar, microwave radiometer and sun-photometer) allow us to characterize the mechanisms leading to this so high particle pollution: (i) role of boundary layer dynamics (stable, neutral, convective), (ii) role of geographical origin of PM components (local, regional, European) and (iii) role of liquid phase (fog and boundary layer cloud). Finally, the impact on solar and ultra-violet downwelling fluxes will be quantified.
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Submitted on : Wednesday, August 8, 2018 - 11:12:42 AM
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J.C. Dupont, Martial Haeffelin, J. Badosa, T. Elias, Nicolas Bonnaire, et al.. Analysis of a high level of particulate-pollution event in Paris Megacity by integrating in-situ and remote sensing aerosol / gas measurement at the SIRTA ACTRIS Observatory. 4. ACTRIS General Meeting, Jun 2014, Clermont-Ferrand, France. ⟨ineris-01855513⟩

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